<template>
  <div>
         <!-- 面包屑 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图 -->
      <el-card>
                <!-- 警告区 -->
        <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>
                <!-- 步骤区 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
        </el-steps>
                 <!-- tab栏区域 -->
         <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
         <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
         <el-tab-pane label="基本信息" name="0">

             <el-form-item label="商品名称" prop="goods_name">
                 <el-input v-model="addForm.goods_name"></el-input>
             </el-form-item>

             <el-form-item label="商品价格" prop="goods_price">
                 <el-input v-model="addForm.goods_price" type="number"></el-input>
             </el-form-item>

             <el-form-item label="商品重量" prop="goods_weight">
                 <el-input v-model="addForm.goods_weight"></el-input>
             </el-form-item>

             <el-form-item label="商品数量" prop="goods_number">
                 <el-input v-model="addForm.goods_number"></el-input>
             </el-form-item>

             <el-form-item label="商品分类" prop="goods_cat">
                 <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="{ expandTrigger: 'hover' ,label:'cat_name',value:'cat_id',children:'children' }" @change="handleChange"></el-cascader>
             </el-form-item>

         </el-tab-pane>

         <el-tab-pane label="商品参数" name="1">

                 <!-- 渲染表单的item项 -->
             <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
                 <!-- 复选框组 -->
                   <el-checkbox-group v-model="item.attr_vals">
                   <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                   </el-checkbox-group>
            </el-form-item>

         </el-tab-pane>

         <el-tab-pane label="商品属性" name="2">
             <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
                 <el-input v-model="item.attr_vals"></el-input>
             </el-form-item>
         </el-tab-pane>

         <el-tab-pane label="商品图片" name="3">
             <el-upload 
                action="https://lianghj.top:8888/api/private/v1/upload"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                 list-type="picture"
                 :headers="headerObj"
                 :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
              </el-upload>

         </el-tab-pane>

         <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
         </el-tab-pane>
         </el-tabs>
         </el-form>


      </el-card>
     <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%" class="previewImg">
          <img :src="previewPath" >
      </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
    name:'',
    data() {
        return {
            activeIndex:'0',
            //添加商品表单对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat:[],
                //图片的数组
                pics:[],
                //商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            //表单验证规则
            addFormRules:{
                goods_name:[{required:true,message:'请输入商品名称',trigger:'blur'}],
                goods_price:[{required:true,message:'请输入商品价格',trigger:'blur'}],
                goods_weight:[{required:true,message:'请输入商品重量',trigger:'blur'}],
                goods_number:[{required:true,message:'请输入商品数量',trigger:'blur'}],
                goods_cat:[{required:true,message:'请选中商品分类',trigger:'blur'}],
            },
            //商品分类列表
            catelist:[],

            //动态参数列表数组
            manyTableDate:[],
            onlyTableDate:[],
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },

    created(){
        this.getCateList()
    },

    methods: {
        //获取所以商品分类数据
      async  getCateList(){
          const {data:res} = await  this.$http.get('categories')
          if(res.meta.status !== 200){
               return this.$message.error('获取商品分类数据失败')
           }
           this.catelist=res.data
           console.log(res);
        },

        //级联选择器选择项变化，会触发这个函数
        handleChange(){
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },

        //商品分类没选中，不能跳转
        beforeTabLeave(activeName,oldActiveName){
             if(oldActiveName === '0' && this.addForm.goods_cat.length!==3){
                 this.$message.error('请选择商品分类')
                 return false
             }
        },

       async tabClicked(){
            //证明访问的是动态参数面板
            if(this.activeIndex === '1'){
              const {data:res} = await  this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many' }})
              if(res.meta.status !== 200){
               return this.$message.error('获取数据失败')
               }
               
               res.data.forEach(item=>{
                  item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
               })

               console.log(res);
               this.manyTableDate = res.data

            } else if(this.activeIndex === '2'){
              const {data:res} = await  this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only' }})
              if(res.meta.status !== 200){
               return this.$message.error('获取数据失败')
               }
               this.onlyTableDate=res.data
            }
        },

        //处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible=true
        },
        //处理移除图片的操作
        handleRemove(file){
            //1.获取将要删除的图片临时路径
            const filePath = file.response.data_tmp_path
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x =>x.pic === filePath)
                
            //3.调用数组的splice方法，把图片信息对象，从pics数组中移除 
            this.addForm.pics.splice(i,1)  
            console.log(this.addForm)
            
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            //1拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            //2将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('添加必要的表单项')
                }
                //执行添加的业务逻辑
                const form = _.cloneDeep(this.addForm)
               form.goods_cat = form.goods_cat.join(',')
               //处理动态参数
               this.manyTableDate.forEach(item=>{
                   const newInfo = {attr_id:item.attr_id,
                   attr_value:item.attr_vals.join(',')}
                   this.addForm.attrs.push(newInfo)
               })
               //处理静态参数
               this.onlyTableDate.forEach(item=>{
                   const newInfo = {attr_id:item.attr_id,
                   attr_value:item.attr_vals.join}
                   this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            console.log(form);

               //发起请求添加商品
               //商品名称，必须是唯一的
               const {data:res} = await this.$http.post('goods',form)
               if(res.meta.status !== 201){
                      return this.$message.error('添加商品失败')
               }
                       this.$message.success('添加商品成功')
                       this.$router.push('/goods')
          })
        },
    },

    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style>
.el-steps{
    margin: 15px 0;
}
.el-step__title{
    font-size: 5px;
}
.el-checkbox{
    margin:0 5px 0 0 !important;
}
.ql-editor{
    min-height: 300px;
}
.btnAdd{
    margin: 15px;
}
</style>